CORRESPONDENCE - 75A (COMMENT) - Laserfiche WebLink

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Law Office of Kara E. Grant RK 15591 Page 2 for express car wash sites and has recorded noise levels above 90 dBA Leq and 100 dBA Lmax at the exit of the tunnel, near the blowers. Attachment A shows the manufacture's noise level readings for a Ryko Solutions 3-Fan SlimLine Dryer system installed in a car wash tunnel. As can be seen in the attachment, noise levels of approximately 90 decibels were recorded at 10 feet from the exit of the tunnel. This is significantly louder than the referenced 81.9 dBA noise levels at 13 feet utilized in the Noise Study. The Noise Study also utilizes noise levels of 73.7 dBA at 20 feet for sound propagating from the tunnel exit at 90 degrees off -center. As shown in Attachment A, noise levels at 25 feet at 90 degrees off -center are shown to be 80.5 decibels for typical equipment. This too is significantly louder than what is projected in the Noise Study. As a result, the Noise Study may underestimate future noise level impacts from the car wash tunnel. 2. Page 19, Car Wash Operations. The Noise Study does not discuss or analyze the noise level impacts from the self -serve vacuums. Per RK's understanding, approximately 20 self -serve vacuum stalls will be provided on the project site. The Noise Study should analyze and disclose the noise level impact from all vacuum locations, as they will be a major source of noise. For example, RK has measured noise levels up to 90 decibels near vacuum service areas. As a result, the Noise Study may underestimate future noise level impacts to adjacent land uses. 3. Page 19, Car Wash Operations and Table 1 Car Wash Noise Levels. The Noise Study states, "because noise levels generated by the carwash operations would be similar to those experienced from traffic impacts, the increase would be less than 3 dBA, typically a threshold used to determine if the increase in noise would be perceptible." However, upon looking at the projected car wash noise levels, shown in Table 1, the project noise contribution would be 66.7 dBA Leq at R-6, Medical Office. When the project noise is added to the daytime noise levels at LT-1, reported as being 66 dBA during the 10:00 AM and 11:00 AM hours, the resulting noise level is approximately 69.4, 3.4 decibels higher than the ambient. As stated above, this would typically exceed the threshold of human perception and is frequently considered a substantial permanent increase in the ambient environment; thus triggering a significant impact under CEQA. Although the adjacent medical office land use does contain noise sensitive exterior areas, further analysis and mitigation should be provided to demonstrate that the project would not adversely affect the noise sensitive interior areas of the medical office building. ®onglinnnring group, Inc. rkengineeccom